Plus be careful with the connection from a Pro Amp. I've got a Crest Audio power Amp. 450watts stereo 900 bridged. which needs 1/4 TRS connection the damn thing picks up every ground issue. My previous AVR was also Pro{Teac pro}
Tried connecting it to my current setup Anthem MRX720 for rear heights {ATMOS}.
Instant buzz, Mind you that's with my ADA1250 {front3}connected as well.